html,
body {
  height: 100%;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
ul {
  list-style: none;
}

.top {
  height: 50px;
  background-color: #001529;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  z-index: 2;
}
.container {
  padding-left: 200px;
  .left {
    width: 200px;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    padding-top: 50px;
    background-color: #fff;
    box-shadow: 2px 0 8px 0 rgb(29 35 41 / 5%);
  }
  .main {
    background-color: #def6ff;
    padding: 20px;
    min-height: calc(100vh - 50px);
  }
}
